Drus are male tree spirits, similar to dryads.

There’s this whole story I have about this particular drus and the phoenix and how he lost his arm… She had collapsed in his branches, close to death with creatures of the night closing in around them. The drus protected the phoenix in her weak state through the night and as the firmament brightened to dawn he lifted her high as phoenix’s do what they do best, where she burst into flames to be reborn. He lost his arm, but gained a friend. (and the arm will grow back, but slowly, phoenix fire is harsh)